<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.10/vue.js"></script>
</head>
<body>
<div id="app">
    <App></App>
</div>
<script>
    const App = Vue.extend({
        template:`
        <div>
            <h1>App组件{{count}}</h1>
            <button @click="changeCount">累加</button>
        </div>
        `,
        data(){
            return{
                count:1,
            }
        },
        methods:{
            changeCount(){
                //
                console.log(this,"this")
                this.count++;
            }
        }
    })
    //可以看出是一个构造函数VueComponment
    console.log(App,"App")
    const vm = new Vue({
        el:"#app",
        data(){
            return{}
        },
        components:{
            App,
        }
    })
</script>
</body>
</html>
<script>
</script>